PREGNANCY-BIRTH Messages for January, 2002: 15mm amniotic sac measurement margin of error?

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15mm amniotic sac measurement margin of error?

From: Carla (anonymous@obgyn.net)
Mon, 21 Jan 2002 08:41:32 -0600 (CST)

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Reply: j wang, M.D.: "Re: 15mm amniotic sac measurement margin of error?"

Since 15mm amniotic sac corresponds to 5wks5days pregnant then what is the +\- margin of error with this in days. When a woman has a 28 day cycle it states that you count the first day as day one and on the 14th day is when you should ovulate...well I was wondering if when figuring out ultrasound dating if you count the day to which the ultrasound dates to as day one in the same way, (+\- margin of error) because then 5wks5days would be 3wks4days since conception and not 3wks5days if you simply just add 14 days and not count the first day as day one, correct? yikes...hope you get this.

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